CVE-2026-53996

NetBSD's hdaudio(4) driver in sys/dev/hdaudio/hdaudio.c contains a missing access control vulnerability that allows unprivileged local attackers to invoke the HDAUDIO_FGRP_SETCONFIG ioctl without elevated permissions by exploiting the absence of an access check on /dev/hdaudioN device nodes. Attackers can repeatedly issue HDAUDIO_FGRP_SETCONFIG from one thread while keeping DMA and IRQs live from a second thread to trigger a use-after-free race condition in hdafg_detach() between stream_stop() and stream_disestablish(), where a latched DMA interrupt dereferences a freed callback pointer, resulting in outcomes ranging from audio-subsystem denial of service and kernel panic to potential local kernel privilege escalation.

CVSS v3 7.0 HIGH

7.0^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.0 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://cvsweb.NetBSD.org/bsdweb.cgi/src/sys/dev/hdaudio/hdaudio.c
https://gist.github.com/n4sm/c9683ca728ecfada6c726f2a5afb50ed
https://gnats.netbsd.org/60492
https://www.vulncheck.com/advisories/netbsd-hdaudio-4-driver-privilege-bypass-use-after-free-via-hdaudio-fgrp-setconfig-ioctl

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-12 13:17

Updated : 2026-08-12 16:17

NVD link : CVE-2026-53996

Mitre link : CVE-2026-53996

CVE.ORG link : CVE-2026-53996

JSON object : View

Products Affected

No product.

CWE

CWE-862

Missing Authorization

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